IPython - Command History

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Command history management

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Management

Location

By default, the history file is named .ipython/profile_name/history.sqlite

Arrow

• up- and down-arrow keys
• or Ctrl-p and Ctrl-n

Search

• Ctrl-r

Variable In and out

• Input and output history are kept in variables called In and Out, keyed by the prompt numbers, e.g. In[4].

In?

Type:        list
String form: ['', "print('Hello IPython')", '21 * 2', "def say_hello(name):\n    print('Hello {name}'.format(n <...> = range(10000)', 'max(x)')", "get_ipython().magic('lsmagic')", "get_ipython().magic('pinfo In')"]
Length:      12
Docstring:
list() -> new empty list
list(iterable) -> new list initialized from iterable's items

Shortcut variable

• The last three objects in output history are also kept in variables named _, and _.

Magic

• %history magic function can examine past input and output.
• %edit, %rerun, %recall, %macro, %save and %pastebin can use history input:

%pastebin 3 18-20 ~1/1-5

This will take line 3 and lines 18 to 20 from the current session, and lines 1-5 from the previous session.

Documentation / Reference

• http://ipython.readthedocs.io/en/stable/interactive/tutorial.html#history